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Atmel ATA6670 [DATASHEET]
9204F–AUTO–06/12
In Sleep mode the device has a very low current consumption even during short-circuits or floating conditions on the bus. A
floating bus can arise if the master pull-up resistor is missing, e.g., it is switched off when the LIN master is in Sleep mode or
even if the power supply of the master node is switched off.
In order to minimize the current consumption IVS during voltage levels at the LIN pin below the LIN pre-wake threshold, the
receiver is activated only for a specific time tmon. If tmon elapses while the voltage at the bus is lower than pre-wake detection low
(VLINL) and higher than the LIN-dominant level, the receiver is switched off again and the circuit reverts to Sleep mode. The
current consumption is then the result of IVSsleep plus ILINwake. If a dominant state is reached on the bus, no wake-up will occur.
Even if the voltage rises above the pre-wake detection high (VLINH), the IC will stay in Sleep mode (see Figure 2-3 on page 7).
This means the LIN bus must be above the pre-wake detection threshold VLINH for a few microseconds before a new LIN wake-
up is possible.
Figure 2-3. Floating LIN Bus During Sleep Mode
IVSsleep
IVSfail
+ ILINwake
IVSsleep
VBUSdom
VLINL
I
VS
tmon
LIN Pre-wake
LIN dominant state
LIN BUS
Mode of
operation
Int. Pull-up
Resistor
RLIN
Wake-up Detection Phase
off (disabled)
Sleep Mode
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